| engineering highsteep slopes emerged, and rock slope usually occurs in complex geological environment and has a complex geological structure. The stability of these high slopes is important in construction and operation period. In this paper,the spandrel groove high slope of Dagang Mountain Hydropower Station in Sichuan province has been taken as an example. The combination methods of prototype investigation and indoor analysis, quantitative calculation and qualitative analysis.Dagang Mountain landscape hydropower station is the recent development main dadu river one large-sized hydropower project, design the dam, with a total capacity of high 210m 7.42 billion m3, power stations 2600MW installed capacity. In the dam site area GuPo steep mountain is abundant, Taiwan, natural slope, bedrock bare 40°~ 65°commonly relatively altitude 600m, in general, with more than bedrock of period granite mainly from chengjiang, gray, micro red cloud distribution of adamellite in addition, visible fai green dike (beta), granite fine-grain dike (proposed), shem long gamma delta) and other kinds of dike (with development vein rocks in granite, especially in xinhui green more, GuPo steep dike distribution, geostress, hut to valley high rock direction of airport unloading relatively strong. Dam without area fracture cutting, with tectonic pattern along the vein rocks development of extrusion and fissures with, fault for feature, the origin and nature of liuhuang structure surface can be divided into primary structure surface, tectonic structural planes, according to the traits and fillings situation for the rigid structure surface and into two types of weak structure plane.The arch of the left shoulder trough slope fault, fai green dikes development characteristic, matrix interface crack and dense with developmental characteristics dam fracture analysis of arch, the right shoulder trough slope fault, fai green dikes, matrix fissure and deep unloading analyzed developmental features fractures. Through the survey and analysis of slope lithologic features, structure surface types, the structure of the engineering geological properties and features, determine the arch shoulder slot upstream and downstream and trough slope adverse combination (deterministic combination, half deterministic combination and randomicity combination).The slope rock mass slope deformation damage is in natural history process experience, and long-term deformation fracture in human evolution of engineering activity and influence of the forcings under what happened, in fact, this process, slope stability conditions have been produced the heterogeneity of reduced. Research in the slope deformation failure mode and laws as the main line, emphasize the investigation of geological prototype, namely slope structure, have the phenomenon of deformation and failure investigation and measurement. On this basis, establish the concept of slope deformation and failure model, and through studying the phenomenon of slope deformation and damage clarified through the development rule of the deformation process of slope excavation signs of deformation and failure analysis, determine what happened, establish the causes of follow signs failure modes slope deformation.In the geological survey and the basis of qualitative analysis, synthetically the arch shoulder trough slope follow geological - mechanics - mathematical model, using the method of qualitative analysis and quantitative calculation from the stability of slope deformation and the development trend of the coefficient and the Angle of a shoulder trough slope evaluation arch the stability of slope situation. Through two-dimensional limit equilibrium calculation, analysis the left the stability of adverse combination large body in different conditions can satisfy the requirements, the right for faults and deep large body unloading fissure as bottom sliding surface, stability coefficient is low, various working conditions are not satisfy requirements, the need to strengthen support. Through numerical simulation, the slope excavation process left in the JianBiaoCeng accompanied by a certain amount, unloading rebound, slope displacement is lesser, stable over time, because last right XL316-1 + f231 existence, overall stability is low, low elevation excavation on its front feet along the slope, easy airport cut out.Finally after a comprehensive analysis to arch shoulder trough slope follow Suggestions: to make local unstable body left anchorage processing, once found extensions longer fracture zones and weak interlayers, should take corresponding system; anchorage measures. The deep unloading of the right anchor fault fracture and, in order to improve the overall handling the stability of the right, and in blasting construction process, should strengthen the monitoring of each place, depending on the monitoring situation, adjust blasting system parameter or construction methods etc. To ensure the construction safety. |
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